A water pipe burst on the night to Tuesday, and a man fell into a four-meter shaft, and while rescuers were able to pull him out, the ambulance was unable to save him.
Construction on the site is carried out by general contractor CBF "Ļ-KO".
State Police representative Elīna Sprudzāne confirmed the story to Latvian Radio and said that a criminal case has been started and circumstances are being investigated.
Work safety specialists have examined the site on Tuesday.
In addition, parts of Riga are seeing huge traffic jams on April 3 as the Deglava bridge is open exclusively to public transportation after the pipe burst.
Authorities say it will be fixed today. The municipal Riga Transport company says public transportation delays of up to an hour are expected for a good chunk of municipal transport servicing Riga.
"Trolleys No. 5, 11, 13, 22 and buses No. 3, 6, 13, 47, 50, 51, 52, 49 are the most delayed," the company tweeted.